CCl~2 free radicals were produced by DC discharge of CCl~4 (in Ar). Ground state CCl~2 radical was electronically excited to P^R~1 level of A^1B~1(0, 4, 0) state with Nd:YAG laser pumped dye laser at 541.52 nm. Experimental quenching data of CCl~2 (A 1^B~1 and a 3^B~1) by alcohols were obtained by observing time-resolved fluorescence signals from the excited CCl~2 radicals transition, which showed a superposition of two exponential decay components. The state-resolved rate constants k~q~1, k~q~2 and k~q~3 were acquired for the first time by analyzing the data using three-level-model developed by us. The k~q~1, k~q~2 and k~q~3 increase on the whole with increasing the number of C-H bonds in alcohols. A discussion on the effect of OH group and molecular structure in alcohol on the effect of OH group and molecular structure in alcohol on the quenching of excited CCl~2 radical is presented.

Key words: ALCOHOL, KINETIC STUDY